Sand-packing device for pipe molds



March 3, 1931. L. L. MATHIEU SAND PACKING DEVICE PoR PIPE Moms Filed Dec.

March 3, 1931. L. MATHIEU SAND PACKING DEVICE FOR PIPE MOLDS 2 Sheets-Sheet 2 Filed Dec.

Patented Mar. 3, 1931 UNITED STATES PATENT ori-ICE LEON LOUIS MATHIEU, F ROUEN, FRANCE, ASSIGNOR TO SOCIETE ANONYME Dm HAUTS-FOUBNEAUX ET FONDERIES DE PONT-A-MOUSSON, OF 'PONT-A-IOUBSON,

IEUBTHE-ET-MOSELLE, FRANCE SAND-PACKING DEVICE FOR PIPE MOLDS Application filed December 29, 1928, Serial No. 329,205, and in France'April 27, 1928.

This invention relates tothe-manufacture of pipe molds, and more particularly socket pi e molds used for casting pipes by the centrifugal method. More specifically, the inl vention comprises improved means for the compression of sand in a suitable flask in one piece, the primary object of the invention being to provide for an appartus adapted to work in a rapid and reliable manner, and to deliver pipe molds in which the sand is roperl compressed in all parts of the mol he characteristic features of the iniproved apparatus will be specified in the following description and more fully pointed out in the claims.

In the accompanying drawings which are given solely by way of example:

Fig. 1 is a general elevational view of the apparatus.

Fig. 2 is a vertical section on a larger scale 4through the lower portion of the apparatus, the parts being shown in the position they assumed before clamping the flask in position.

Fig. 3 is a view corresponding toFig. 2 showing the position of the parts during the sand filling.

Fi 4 is a view analo ous to Fig. 3, correponing to the end o the compression of 3 the sand in the lower part of the apparatus.

In the form of construction herein represented, the tubular {lasks 1 (Fig. 2) comprise a tubular body, an upper head la and a lower head 1b. They are provided at the centre with a supporting sleeve 2 (Fig. 1) carrying trunnions 3 by which they can be taken up from the horizontal position by a hoisting apparatus and placed in the vertical position on a rotatable frame 4. The frame 4 is adapted to receive a certain number of flasks, four for instance, and is rotatably supported upon one of the columns 5 of the packing tower. By rotating the frame 4, the flasks 1 may be successively brought at the centre of the tower, as shown in Figs. 1 and 2, the top head 1a of the flask to be packed with sand being then exactly below a centering cross-frame 6 provided on the tower and forming an abutment for the flask. Below the lower head 1b 5 of the flask is mounted a double hydraulic press or like apparatus shown in vertical section in Fig. 2, and comprising two pistons 7 and 8. The outer hollow piston 7 is movable in a fixed cylinder 9, to which the power fluid (water, steam, etc.) is admitted at 10, the exhaust being shown at 11. In the piston 7 is movable the inner piston 8, for which the admission'takes place at 26 and the exhaust at 12.

The outer piston 7 carries the pattern 16 for the socket of the pipe, throu h the medium of an annular su port 14, an a cen. tering member 13.y Suitable vibrators 15 are mounted on the latter.

The inner piston 8 carries at the top an abutment or ejector 17 and is adapted to make contact with the lower end 16 of the pattern 16.

The core 18 used for ressin the sand in the cylindrical part of t e mol comprises a cylindrical body provided at its lower end with a cylindrical head or mandrel 20, the cylindrical surfaces of the body and head being connected by a conical surface 18. The diameter D of the head 20 is equal to the 75 outer diameter of the pipe to be cast and and the diameter d of the core body is slightly less. The abutment or ejector 17 on the inner piston 8 is adapted to press upwardly on a stud y2Oa provided on the head 2O.

With the flask 1 in the position shown in Figs. 1 and 2, the fluid is admitted at 10 and raises the piston 7, and the flask is thus centered on the member 13. As the piston continues to rise, the flask is lifted and centered by its upper head 1 in the cross member 6. The core 18 .is then placed within the flask and centered at the to ina removable centering ring 19 and at t e bottom, its head 2O is centere in a corresponding bore of the pattern 16. A

In said position, the core rests with its lower head 20 upon the abutment 17 of the piston 8, and a clearance or space a b is left etween the top of the piston 8 and the bottom 16JJL of the pattern 16 carried by the centering member 13.

Sand is then filled from the top into the annular s ace between the flask and the core, and etween the head 1b and the pat- 100 tern 16. The sand may be supplied by the device shown in Fig'll and comprisin a sand hopper 21, fromw screw conveyor v2 2in'to a vibrating sieve 23,

the core 18 and the A' further the descent o 19. The vibrators 15 l the' sand to. the lower Both the screw conveyor and sieve may be moved aside for the insertion and removal of the core 18 from the top.

lThe sand will thus com .lar space f betweentl'i'e ask 1 and the core 18 and also the annular space g between the head 1" andthe pattern 16, which space corresponds to the socket end of the pipe. The

--nfirst place the ejector 1 7 carried by said isinner piston 8 is then actuated, and in the ton, raises'the core 18 by an amolmt equa -to the space' aff-b, whereby the sand 1scom pressed by the conical part 18* and cylindrical head 2O of the core at the junction between the spaces f and g.

The iston 8 in its upward stroke will then bring t e pattern 16 into the elevated position shown in Fig. 4, whereb the sand 1s compressed in the space g. he core 18 is then raised further by the Winch 25 Fig. 1), which.

is accurately centered, where y its conical part 18 and cylindrical head 20 will compress the sand in the space f.

Obviously, the invention is not limited to the orms of construction hereinbefore specified which are given solel by way of exam le.

Having now describedY my invention w at I claim as new and desire to secure by Letters Patent is 1. A sand packing apparatus. for socket pipe molds, comprising a flask member and a core for the ipe body, a head member and a pattern for t e pipe socket, an abutment for the flask, an outer piston Afor bodilypressing the head member and the ask member against the abutment, an inner piston adapted to successively displace the core member and the pattern, means for actuating said pistons and means for inserting and removing the core member through the pattern and fiask member. v v

2. A sandA packing apparatus .for socket pipe molds, comprising a vertically arranged ask member and a core for the pipe body, a

head member and a pattern for the pipe sockch the sand is ed by al letely iill the a-nnuer, the core having a head and the the pattern and iiask member, means for i placlng the pattern in the head member and means Afor inserting and removin the core member through the pattern and ask mem- -Below the sieve, is funnel member 24 which 1 feeds the sandf tfthennnular space between v pipe socket, means or pressing the sand in the body member, said means includin a main ramming pattern axially mova le lengthwise of the flask member a movable head pattern for pressing the sand in the head member,means for moving said head pattern, a stationary abutment adapted to engage the end of the flask member opposite the socket and means for axiall moving the iask andthe head member an pressing them against said stationaryabutment.

4. A sand packing apparatus for socket pipe molds comprising a ask member and a core for the pipe body, a head member for the ipe socket, means for pressing the sand in t e body member, said means includin a main ramming pattern axially mova le" lengthwise of t-he Hask member, a movable head pattern for pressing the sand in the head member, means for moving said head pattern, a stationary abutment adapted to engage the end `of the flask member opposite the socket; means for axiallfy moving the flask and the head member an pressing them against said stationar abutment, said means including a power uid driven iston carrying acenter-v ing piece for the soc et end of the ask.

5. A sand packing ap aratus for socket pipe molds comprising a ask member and a core for the pipe bod a head member for the pipe socket, means or pressing the sand inI the body member, said means including aI main ramming pattern axially movable lengthwise of the flask member, a movable head pattern for pressing the sand in the head member, means for moving said head pattern, a stationary abutment adapted to engage the end of the flask member opposite the socket, means for axially moving the fiask and the head member and pressing them against said stationary abutment and a apted also to draw with it the head pat"y tern.

6. A sand packing ap aratus for socket pipe molds comprising -a ask member and a core for the pipe bod ,a head member for the pipe socket, means or pressing the sand in the body member, said means including a main ramming pattern axially movable lengthwise of the flask member, a movable head pattern for pressin the sand in the head member, a stationary a utment adapted toV engage the end of the flask member opposite carrying a centering member for the socket end of the flask, the head pattern being slidably carried by said centering member whereby it may be moved axially together with said centering member, 'a second power iuid driven piston slidably extending through the first named piston which forms the cylinder for said last named piston and adapted to engage and move said head pattern independently of said centering member.

7. In a sand packing apparatus as claimed in claim 6, the further feature residing in that said first named piston is adapted to draw with it in its forward stroke said last mentioned piston.

8. A sandpacking apparatus as claimed in claim 6, in which the means for moving axially the main ramming pattern includes a. hoisting device, the provision of means adapted to cause said second piston to engage and move axially said main pattern on a determined length prior to engage and move the head pattern.

9. A sand packing apparatus for socket pipe molds comprising a flask member and a core for the pipe body, a head member for the pipe socket, means for pressing the 'sand in the body member, said means including a main ramming `pattern axially movable lengthwise of the flask member, a movable' head pattern for pressing the sand in the head member, means for moving said head pattern, a stationary abutment adapted to W engage and center the end of theiiask mem` ber op osite the socket, a centeringy piece for the soc et end and means for axially moving lcentering piece flask and head member so as being movable axially, and means for axially r mo ving said centering member together with the head member and the ask so as to center the flask at both ends.

In testimony whereof I have signed my name to this specification.

LON LOUIS MATHIEU. 

